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    <title>Document</title>
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        //鼠标事件对象
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            //1.client 获取鼠标在可视区的x和y坐标
            console.log(e.clientX);
            console.log(e.clientY);

            //2. page 获取鼠标在页面文档的x和y坐标
            console.log(e.pageX);
            console.log(e.pageY);

            //3. screen 鼠标在电脑屏幕的X和Y坐标
            console.log(e.screenX);
            console.log(e.screenY);
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